class Customer{
	String account;
	double balance;

	public static void main (String[] args) {
		Customer zs = new Customer();	zs.balance = 1000;
		Customer ls = new Customer();	ls.balance = 2000;
		zs = ls;
		System.out.println(zs.balance);
		System.out.println(ls.balance);
		zs.balance += 10000;
		System.out.println(zs.balance);
		System.out.println(ls.balance);
		
		
	}
}